Solar wind disturbance changes between L1 and Earth's magnetosphere: Modeled series at L1 and real events

Details Solar wind disturbance changes between L1 and Earth's magnetosphere: Modeled series at L1 and real events Solar wind disturbance changes between L1 and Earth's magnetosphere: Modeled series at L1 and real events

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51a1607p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51A-1607

Other

2154 Planetary Bow Shocks, 2724 Magnetopause And Boundary Layers, 2728 Magnetosheath, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

While modeling the solar wind interaction with the Earth's magnetic dipole, most of the existing MHD codes set initial boundary conditions at ~35 Earth radii upstream. These modeling results are often compared with measurements taken by various spacecraft located at the Lagrangian L1 point and flown within the Earth's magnetosphere at high and low orbits, and the ground-based observations. At the same time, a number of experimental magnetospheric and space weather models utilize the L1 observations as input parameters. These discrepancies in the outer boundary conditions may cause misinterpretation of the MHD & experimental modeling results and real observations across various domains. Although numerous techniques were developed for processing the solar wind plasma over ~200 Re between L1 and Earth (from simple ballistics to minimum-variance methods), none of these techniques help when the slower and faster plasma packets intersperse, causing various SW and IMF discontinuities heavily interact with each other on their way to Earth. In this study, we attempted to understand through the MHD modeling how the pulsing (i.e., slowing/accelerating) solar wind flow changes along the way from L1 to Earth, and compare these modeling results with a few real events measured by the ACE-WIND spacecraft pair during the intervals of minimal spacecraft transverse separation. Our results might help in better understanding how the L1 solar wind data should be used in the current techniques for space weather specification and forecasting.

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